MILLIPEDS OF PANAMA—LOOMIS 97 
ones elongate oval with the foremost one largest, the fifth tubercle 
submedian, round and next in size. 
Ensuing segments with four high thin triparted ridges of equal size 
on all segments to 17 or 18, where the outer ridge decreases and the 
two inner ones increase in size and are moderately produced caudally; 
there is no indication of a third ridge on each side as in B. cryptus; 
surface between ridges and laterad of them apparently roughened but 
mostly hidden beneath coating of organic matter; lateral carinae 
broader than in genotype, the outer margin of those on segments 2 
and 18 trilobed, the intervening ones bilobed; pores in normal sequence, 
opening from a broad, low swelling on surface of last lobe of carina 
except on penultimate segment which has lateral carinae reduced in 
size but more strongly produced backward, the pore opening from a 
conic tubercle projecting back over the posterior margin of the third 
lobe. Last segment rather large with an elongate ridge on each side 
of middle, posterior margin broadly and evenly rounded, with a broad 
median lobe and three smaller lobes on each side, separated by more 
or less open sinuses, depending on amount of organic matter they 
contain. 
Gonopods as shown in figure 3/—m. 
Genus Cynedesmus Cook 
Cynedesmus Cook, American Nat., vol. 30, p. 419, 1896. 
Cynedesmus trinus Loomis 
Cynedesmus trinus Loomis, Journ. Kansas Ent. Soc., vol. 32, No. 1, figs. 9-10, 
1959. 
A mature and two 19-segmented females, Cerro Campana, Panama, 
March 16, 1958, G. B. Fairchild and H. F. Loomis. 
Genus Poratia Cook and Cook 
Poratia Cook and Cook, Ann. New York Acad. Sci., vol. 8, p. 238, 1894. 
Dominicodesmus Chamberlin, Proc. Biol. Soc. Washington, vol. 36, p. 189, 1923. 
Tidopterus Chamberlin, Zoologica, New York, vol. 3, No. 21, p. 420, pl. 27, figs. 
7-9, 1923. 
In determining specimens in the present collection, reference was 
made to Silvestri’s excellent treatment of Poratia (Bol. Soc. Espafiola 
Hist. Nat., vol. 23, pp. 372-375, illus., 1923), when it was found that 
specimens of the genotype species, P. digitata (Porat), were repre- 
sented in the Panamanian fauna. Its resemblance to Psochodesmus 
crescentis Cook led the writer, on a recent visit to Washington, to seek 
the type of that species in the U.S. National Museum collection. 
Fortunately, this was found and a brief examination showed it to be 
a male with gonopods, which were not dissected, very similar to those 
